gdal_translate -a_srs "+proj=latlong +datum=WGS84" -of GTiff -co "INTERLEAVE=PIXEL" -a_ullr -180.0 90.0 180.0 -90.0 water_world.png water_world_geo.tif
gdal_translate -a_srs "+proj=latlong +datum=WGS84" -of GTiff -co "INTERLEAVE=PIXEL" -a_ullr -1.0 1.0 1.0 -1.0 airport_0E0N.png airport_0E0N_geo.tif

vpbmaster -t water_world_geo.tif --geocentric -o terrain/terrain.osgb
vpbmaster --patch build_master.source -t airport_0E0N_geo.tif
